CN111836400A

CN111836400A - Random access message sending method and terminal for unlicensed frequency band

Info

Publication number: CN111836400A
Application number: CN201910760103.0A
Authority: CN
Inventors: 沈晓冬; 潘学明
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-10-27
Anticipated expiration: 2039-08-16
Also published as: CN111836400B; WO2021031907A1

Abstract

The embodiment of the invention provides a random access message sending method and a terminal of an unauthorized frequency band, wherein the method comprises the following steps: the physical layer performs LBT on N1 first random access channel positions selected by a high layer, wherein the N1 first random access channel positions comprise at least one random access channel corresponding to a starting time point, each starting time point comprises M random access channels, and at least one starting time point belongs to a random access channel associated period; under the condition that L random access channels LBT of a first starting time point are successful, a physical layer sends a random access message in a target random access channel; wherein N1, M, and L are positive integers, M is less than or equal to N1, and M is greater than or equal to L, the first starting time point is one of the at least one starting time point, and the target random access channel is one of the L random access channels. The embodiment of the invention improves the success rate of sending the random access message and reduces the time delay of the random access.

Description

Random access message sending method and terminal for unlicensed frequency band

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and a terminal for sending a random access message in an unlicensed frequency band.

Background

In an unlicensed frequency band of a New Radio (NR), generally, Listen Before Talk (LBT) is required for sending a random access message, and when the LBT is successful, the random access message is sent. For example, a terminal or a network device needs to make a Clear Channel Assessment (CCA) or an extended Clear Channel assessment (eCCA) to listen to a Channel, that is, perform Energy Detection (ED), and when the energy is lower than a certain threshold, the Channel is determined to be empty, so that the terminal or the network device can start transmitting a random access message.

However, in the prior art, after a terminal performing initial access selects a Synchronization Signal Block (SSB), one RACH occasion is randomly selected at equal probability at a continuous Random access channel location (RACH occasion) corresponding to the SSB for Random access, and if LBT fails and a Random access message cannot be transmitted at the RACH occasion, it is necessary to transmit a Random access message at a period related to the next RACH. This results in a large delay for random access.

Disclosure of Invention

The embodiment of the invention provides a random access message sending method and a terminal of an unauthorized frequency band, which aim to solve the problem of longer time delay of random access.

In a first aspect, an embodiment of the present invention provides a method for sending a random access message in an unlicensed frequency band, where the method is applied to a terminal, and includes:

the physical layer performs Listen Before Talk (LBT) on N1 first random access channel positions selected by a high layer, wherein the N1 first random access channel positions comprise at least one random access channel corresponding to a starting time point, each starting time point comprises M random access channels, and the at least one starting time point belongs to a period associated with one random access channel;

under the condition that L random access channels LBT of a first starting time point are successful, the physical layer sends a random access message in a target random access channel;

wherein N1, M and L are positive integers, M is less than or equal to N1, and M is greater than or equal to L, the first starting time point is one of the at least one starting time point, and the target random access channel is one of the L random access channels.

In a second aspect, an embodiment of the present invention further provides a terminal, where the terminal includes:

a processing module, configured to perform listen before talk LBT on N1 first random access channel positions selected by a higher layer by a physical layer, where the N1 first random access channel positions include at least one random access channel corresponding to a starting time point, and each starting time point includes M random access channels, and the at least one starting time point belongs to a period associated with one random access channel;

a first sending module, configured to send, by the physical layer, a random access message on a target random access channel under the condition that L random access channels LBT at a first starting time point are successful;

In a third aspect, an embodiment of the present invention further provides a terminal, including: the random access message sending method comprises a memory, a processor and a program which is stored on the memory and can run on the processor, wherein the program realizes the steps in the random access message sending method of the unlicensed frequency band when being executed by the processor.

In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the steps of the random access message sending method for an unlicensed frequency band.

The embodiment of the invention can carry out LBT on a plurality of first random access channel positions selected by a high layer in a random access channel association period through a physical layer, and can send a random access message under the condition that one random access channel position LBT is successful. Therefore, random access messages can be tried to be sent at a plurality of random access channel positions in a period associated with one random access channel, so that the success rate of sending the random access messages is improved, and the time delay of random access is reduced.

Drawings

Fig. 1 is a block diagram of a network system to which an embodiment of the present invention is applicable;

fig. 2 is a flowchart of a method for sending a random access message in an unlicensed frequency band according to an embodiment of the present invention;

fig. 3 is a structural diagram of a terminal according to an embodiment of the present invention;

fig. 4 is a structural diagram of another terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "comprises," "comprising," or any other variation thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the use of "and/or" in the specification and claims means that at least one of the connected objects, such as a and/or B, means that three cases, a alone, B alone, and both a and B, exist.

In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

Embodiments of the present invention are described below with reference to the accompanying drawings. The random access message sending method and the terminal of the unlicensed frequency band provided by the embodiment of the invention can be applied to a wireless communication system. The wireless communication system may be a 5G system, an Evolved Long Term Evolution (lte) system, or a subsequent lte communication system.

Referring to fig. 1, fig. 1 is a structural diagram of a network system to which an embodiment of the present invention is applicable, and as shown in fig. 1, the network system includes a terminal 11 and a network device 12, where the terminal 11 may be a user terminal or other terminal-side devices, for example: it should be noted that, in the embodiment of the present invention, a specific type of the terminal 11 is not limited, and the terminal may be a terminal-side Device such as a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), or a Wearable Device (Wearable Device). The network device 12 may be a 5G base station, a later-version base station, or a base station in another communication system, or referred to as a node B, an evolved node B, or a Transmission Reception Point (TRP), an Access Point (AP), or another vocabulary in the field, and the network device is not limited to a specific technical vocabulary as long as the same technical effect is achieved. In addition, the network device 12 may be a Master Node (MN) or a Secondary Node (SN). It should be noted that, in the embodiment of the present invention, only the 5G base station is taken as an example, but the specific type of the network device is not limited.

Referring to fig. 2, fig. 2 is a flowchart of a method for sending a random access message in an unlicensed frequency band according to an embodiment of the present invention, where the method is applied to a terminal, and as shown in fig. 2, the method includes the following steps:

step 201, a physical layer performs Listen Before Talk (LBT) on N1 first random access channel positions selected by a high layer, wherein the N1 first random access channel positions include at least one random access channel corresponding to a starting time point, each starting time point includes M random access channels, and the at least one starting time point belongs to a random access channel associated period;

step 202, under the condition that L random access channels LBT at a first starting time point are successful, the physical layer sends a random access message in a target random access channel;

In the embodiment of the invention, the mapping relation between the random access Resource and the SSB is configured through a high-level parameter SSB-perRACH-OccasionindCB-preamblispersB to obtain the number N of the SSBs associated with a Resource location (RO) and the number of PRACH preambles which are effective on each RO of each SSB. (it should be noted that this resource location may also be understood as a random access channel location). in this embodiment, the above-mentioned N1 first random access channel locations are RACH occasions selected by a higher layer from consecutive candidate random access channel locations. The candidate random access channel location may be one or more SSB associated RACH occasions. Specifically, the candidate random access channel positions are shown in the following table one.

Watch 1

Wherein, RO # 0-RO #15 represent resource locations numbered 0-15 of the candidate random access channel locations, respectively. Each column in table one shows a starting time point, RO #0 to RO #7 are associated with SSB (SSB #0) number 0, RO #8 to RO #15 are associated with SSB (SSB #1) number 1, and the frequency resource ranges corresponding to the resource positions in each row are the same.

In an embodiment of the present invention, the N1 first random access channel locations selected by the higher layer may include one or more random access channel locations at a starting time point. One or more random access channel locations may be selected within each starting point in time. When the physical layer performs LBT on the N1 first random access channel positions, LBT may be performed on each first random access channel position in sequence according to the starting time point.

In case that one or more random access channels LBT of the physical layer at one of the at least one starting time point (i.e. the first starting time point) are successful, one random access channel may be selected with equal probability to transmit the random access message.

It should be noted that the above-mentioned N1 first random access channel positions may include one or more random access channel positions at starting time points, and the following describes in detail the case where the N1 first random access channel positions include 1 random access channel position at starting time points and include at least two random access channel positions at starting time points through different embodiments.

Scheme 1: if the N1 first random access channel locations include at least two random access channel locations at the starting time point, the performing, by the physical layer, listen-before-talk LBT on the N1 first random access channel locations selected by the higher layer includes:

the high layer selects at least two random access channels corresponding to the starting time points at the position of the candidate random access channel to obtain the N1 first random access channels;

and the physical layer sequentially performs LBT on the N1 first random access channels according to a starting time point.

It should be understood that the manner of selecting the N first random access channels may be set according to actual needs, for example, in an embodiment, the selecting, by the higher layer, random access channels corresponding to at least two starting time points at candidate random access channel positions, and obtaining the N1 first random access channels includes:

dividing successive candidate random access channel positions into Q groups of random access channel positions in terms of time and/or frequency, Q being an integer greater than or equal to N1;

randomly selecting N1 groups of random access channel positions from the Q groups of random access channel positions;

randomly selecting 1 random access channel position from each of the N1 sets of random access channel positions to obtain the N1 first random access channel positions.

In this embodiment, when Q is greater than N1, N1 groups of random access channel positions may be selected at equal probability in the Q groups of random access channel positions. In case that Q is equal to N1, the divided Q groups of random access channel positions are directly determined as N1 groups of random access channel positions.

In another embodiment, the selecting, by the higher layer, random access channels corresponding to at least two starting time points in the candidate random access channel positions to obtain the N1 first random access channels includes:

randomly selecting a third starting time point from starting time points corresponding to continuous candidate random access channel positions;

selecting K random access channel positions at each starting time point in the third starting time point and all starting time points after the third starting time point to obtain the N1 first random access channel positions, wherein K is a positive integer less than N1.

In this embodiment, as shown in table i, when K is 1 and the third starting time point is the starting time point corresponding to the second column, one RO may be selected from each of the second column, the third column and the fourth column to obtain N1 first random access channel locations, such as RO #4, RO #10 and RO # 15.

And when K is larger than 1, the K random access channel positions are positioned on different frequency resource ranges. The frequency resource range may be set according to actual needs, for example, in this embodiment, referring to the first table, the first row and the second row correspond to a frequency resource range, and the third row and the fourth row correspond to a frequency resource range. When K is 2 and the third starting time point is the starting time point corresponding to the second column, N1 first random access channel locations, such as RO #4, RO #6, RO #8, RO #11, RO #13, and RO #15, can be obtained by selecting two ROs from each of the second column, the third column, and the fourth column.

Further, after the high layer selects the N first random access channels, the high layer may further perform the following actions:

the higher layer determines the related information of the N1 first random access channels;

the high layer sends the related information to the physical layer;

wherein the related information includes a Random Access PREAMBLE INDEX (PREAMBLE _ INDEX), a Random Access PREAMBLE TARGET RECEIVED POWER (PREAMBLE _ RECEIVED _ TARGET _ POWER), and a Random Access Radio Network temporary Identity (Random Access Radio Network temporary Identity RA-RNTI).

Optionally, the random access preamble index of the N1 first random access channels is the same as the target received power of the random access preamble;

or the N1 first random access channels include at least two groups of first random access channels divided according to a preset rule, and the random access preamble index of the first random access channel in the same group is the same as the target received power of the random access preamble.

In this embodiment, N1 RACH occasions selected by a terminal at a high level share the same selected random access preamble index and the calculated target received power of the random access preamble, or are divided into at least two groups (for example, according to different mapped SSBs) and share the same selected random access preamble index and the calculated target received power of the random access preamble in each group, and at the same time, N1 RA-RNTIs are respectively calculated, and the related information is sent to a physical layer.

When the physical layer of the terminal performs LBT on N1 RACH occasions, firstly, N1 RACH occasions selected by a high layer are divided into T groups according to different starting time points, and LBT is performed on the RACH occasions of the T groups in sequence according to the starting time points.

Further, in order to reduce the resource occupancy rate and reduce the power consumption of the terminal, in this embodiment, after the physical layer sends the random access message on the target random access channel, the method further includes:

and the physical layer cancels the sending of the random access message on the first random access channel at a second starting time point, wherein the second starting time point is a starting time point after the first starting time point.

In this embodiment, canceling the transmission of the random access message on the RACH occasion at the second starting time point includes canceling the RACH occasion LBT at the second starting time point, or may be that the RACH occasion LBT at the second starting time point succeeds, but the random access message is not transmitted.

Specifically, when at least one RACH occasionLBT at a certain starting time point (the first starting time point) is successful, one RACH occasion is randomly selected from the LBT successful RACH occasions to transmit RACHmessage1, and the transmission of a random access message on the RACH occasion a subsequent starting time point is cancelled, so as to perform a subsequent process with the RA-RNTI corresponding to the selected RACH occasion; otherwise, the RACH occase attempt at the next time point is continued.

Further, when the rachouseion LBT of the last starting time point in the selected N1 first RACH occase still fails, the sending of the random access message of the period corresponding to the current random access channel may be ended. Specifically, after the physical layer sends the random access message in the target random access channel, the method further includes:

under the condition that the position LBT of the N1 first random access channels fails, the physical layer sends a first notification message to the higher layer, wherein the first notification message is used for notifying that the physical random access fails to be sent due to the failure of the LBT;

and the high layer controls a first counter for counting the LBT failure times of the random access channel to be added with N1 according to the first notification message, wherein the times recorded by the first counter are used for triggering the LBT failure recovery process of the random access channel.

Scheme 2: if the N1 first random access channel positions are random access channels corresponding to a starting time point, after the physical layer sends a random access message on a target random access channel, the method further includes:

the physical layer sends a second notification message to the higher layer, wherein the second notification message is used for notifying that the N1 first random access channels fail to be sent;

if the candidate random access channel has an available random access channel after the fourth starting time point, the higher layer randomly selects N2 first random access channels on the available random access channel according to the second notification message;

the upper layer sends the related information of the N2 first random access channels to the physical layer, so that the physical layer can perform LBT on the N2 first random access channels;

wherein the fourth starting time point is the starting time point of the N1 first random access channel positions, and N2 is a positive integer.

In this embodiment, N1 may be 1 or an integer greater than 1. Specifically, when N1 is 1, as shown in the first table, the higher layer may first select a starting time point (i.e. the fourth starting time point, e.g. the starting time point corresponding to RO #0) with equal probability, and select a first random access channel location (e.g. RO #5) with equal probability at the starting time point. The higher layer then determines relevant information corresponding to the RO #5 and transmits the relevant information to the physical layer. And the physical layer performs LBT on the selected first random access channel, and if the LBT of the first random access channel fails, the physical layer sends a second notification message to the higher layer, and the higher layer continues to select a random access channel position of a starting time point after a fourth starting time point to attempt to send the random access message based on the second notification message. It should be understood that the random access channel location selected again may be selected with equal probability or may be the random access channel location of the most recently available starting time point. In other words, the N2 first random access channel positions are the most recently available random access channel positions of the candidate random access channels after the fourth starting time point. Of course, in other embodiments, the N1 first random access channel locations may also be selected from the machine access channel locations associated with one SSB at a time in SSB units.

It should be noted that if N1 is an integer greater than 1, the selected random access channel location may be located in different frequency resource ranges, as shown in table one, the first row and the second row correspond to a frequency resource range, and the third row and the fourth row correspond to a frequency resource range. When N1 is 2, one random access channel location may be selected from the first and second rows and one random access channel location may be selected from the third and fourth rows at a time.

Further, after the physical layer sends the second notification message to the higher layer, the method further includes:

and the high layer controls a second counter for counting the LBT failure times of the random access channel to be added with N1 according to the second notification message, wherein the times recorded by the counter are used for triggering the LBT failure recovery process of the random access channel.

It should be understood that the manner for determining the candidate random access channel may be set according to actual needs, for example, in an embodiment, the candidate random access channel is a random access channel corresponding to at least one synchronization signal block SSB that satisfies a preset condition.

For example, the terminal may select one or more random access channels corresponding to the SSBs from the SSBs with the received power greater than the preset threshold value as candidate random access channels. Because the sending of the random access message is tried on a plurality of SSBs, the success rate of sending the random access message can be improved, and the time delay of the random access is further reduced.

In the case of a 2-step random access channel, the higher layer selects a RACH occasion and also corresponds to a Physical Uplink shared channel location (PUSCH occasion) associated with the RACH occasion. That is, the higher layer sends the relevant information of the RACH occasion to the physical layer, and also sends the relevant information of the PUSCH occasion associated with the RACH occasion to the physical layer.

For better understanding of the present invention, based on the above table i, the following detailed description is made on the specific implementation processes of the above schemes 1 and 2.

With respect to scheme 1 above, when the upper layer of the terminal selects SSB #0 for initial access, its corresponding ROs are distributed in two time units, and these ROs are divided into two groups according to time, namely, (RO #0, RO #1, RO #2, RO #3) and (RO #4, RO #5, RO #6, RO #7), and one RO, for example, RO #2 and RO #6, is randomly selected from each group and relevant information is sent to the physical layer. If the physical layer fails to attempt transmission on RO #2, LBT on RO #6 is continued successfully, and then the RACH message is transmitted.

For the scheme 2, the higher layer of the terminal selects ROs corresponding to SSB #0 and SSB #1 for initial access, and first randomly selects an RO for trying, for example, RO # 6. The user physical layer notifies the higher layer that the attempt at the RO #6 fails, and the higher layer randomly selects the RO #15 at the following RO and fails to attempt transmission, and at this time, the physical layer notifies the higher layer that the RACH transmission fails this time.

Referring to fig. 3, fig. 3 is a structural diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 3, a terminal 300 includes:

a processing module 301, configured to perform listen before talk LBT on N1 first random access channel positions selected by a higher layer by a physical layer, where the N1 first random access channel positions include at least one random access channel corresponding to a start time point, and each start time point includes M random access channels, and the at least one start time point belongs to a period associated with one random access channel;

a first sending module 302, configured to send, by the physical layer, a random access message on a target random access channel in case that L random access channels LBT at a first starting time point are successful;

Optionally, the processing module 301 includes:

a selecting unit, configured to select, by the high layer, random access channels corresponding to at least two starting time points at candidate random access channel positions, so as to obtain the N1 first random access channels;

a monitoring unit, configured to perform LBT on the N1 first random access channels in sequence by the physical layer according to a starting time point.

Optionally, the terminal further includes:

a first control module, configured to cancel, by the physical layer, sending of a random access message on a first random access channel at a second starting time point, where the second starting time point is a starting time point subsequent to the first starting time point.

Optionally, the first sending module 302 is further configured to, in a case that the N1 first random access channel locations LBT fail, send, by the physical layer, a first notification message to the higher layer, where the first notification message is used to notify that this physical random access fails to be sent due to unsuccessful LBT;

and a second control module, configured to control, by the higher layer according to the first notification message, a first counter for counting the number of times of the random access channel LBT failure to add N1, where the number of times recorded by the first counter is used to trigger a random access channel LBT failure recovery procedure.

Optionally, the selecting unit is specifically configured to: dividing successive candidate random access channel positions into Q groups of random access channel positions in terms of time and/or frequency, Q being an integer greater than or equal to N1; randomly selecting N1 groups of random access channel positions from the Q groups of random access channel positions; randomly selecting 1 random access channel position from each of the N1 sets of random access channel positions to obtain the N1 first random access channel positions.

Optionally, the selecting unit is specifically configured to: randomly selecting a third starting time point from starting time points corresponding to continuous candidate random access channel positions; selecting K random access channel positions at each starting time point in the third starting time point and all starting time points after the third starting time point to obtain the N1 first random access channel positions, wherein K is a positive integer less than N1.

Optionally, when K is greater than 1, the K random access channel locations are located on different frequency resource ranges.

Optionally, the terminal further includes:

a determining module, configured to determine, by the higher layer, related information of the N1 first random access channels;

a third sending module, configured to send, by the higher layer, the relevant information to the physical layer;

wherein the related information comprises a random access preamble index, a random access preamble target received power and a random access radio network temporary identifier.

Optionally, when the N1 first random access channel positions are random access channels corresponding to a starting time point, the terminal further includes:

a second sending module, configured to send, by the physical layer, a second notification message to the higher layer, where the second notification message is used to notify that the N1 first random access channels failed to be sent;

a selecting module, configured to, if an available random access channel still exists after a fourth starting time point for the candidate random access channel, randomly select, by the higher layer, N2 first random access channels on the available random access channel according to the second notification message;

a third sending module, configured to send, by the higher layer, information about the N2 first random access channels to the physical layer, so that the physical layer performs LBT on the N2 first random access channels;

Optionally, the N2 first random access channel positions are the most recently available random access channel positions of the candidate random access channels, which are located after the fourth starting time point.

Optionally, the terminal further includes:

and a second control module, configured to control, by the higher layer according to the second notification message, a second counter for counting the number of times of failure of the random access channel LBT to add N1, where the number of times recorded by the counter is used to trigger a random access channel LBT failure recovery procedure.

Optionally, the candidate random access channel is a random access channel corresponding to at least one synchronization signal block SSB that meets a preset condition.

The terminal provided by the embodiment of the present invention can implement each process implemented by the terminal in the method embodiment of fig. 2, and is not described here again to avoid repetition.

Fig. 4 is a schematic diagram of a hardware structure of a terminal for implementing various embodiments of the present invention.

The terminal 400 includes but is not limited to: radio frequency unit 401, network module 402, audio output unit 403, input unit 404, sensor 405, display unit 406, user input unit 407, interface unit 408, memory 409, processor 410, and power supply 411. Those skilled in the art will appreciate that the terminal configuration shown in fig. 4 is not intended to be limiting, and that the terminal may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

The processor 410 is configured to: the physical layer performs Listen Before Talk (LBT) on N1 first random access channel positions selected by a high layer, wherein the N1 first random access channel positions comprise at least one random access channel corresponding to a starting time point, each starting time point comprises M random access channels, and the at least one starting time point belongs to a period associated with one random access channel;

the radio frequency unit 401 is configured to, under the condition that L random access channels LBT at a first starting time point are successful, send, by the physical layer, a random access message in a target random access channel;

It should be understood that, in this embodiment, the processor 410 and the radio frequency unit 401 may implement each process implemented by the terminal in the method embodiment of fig. 2, and are not described herein again to avoid repetition.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 401 may be used for receiving and sending signals during a message sending and receiving process or a call process, and specifically, receives downlink data from a base station and then processes the received downlink data to the processor 410; in addition, the uplink data is transmitted to the base station. Typically, radio unit 401 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. Further, the radio unit 401 can also communicate with a network and other devices through a wireless communication system.

The terminal provides wireless broadband internet access to the user through the network module 402, such as helping the user send and receive e-mails, browse web pages, and access streaming media.

The audio output unit 403 may convert audio data received by the radio frequency unit 401 or the network module 402 or stored in the memory 409 into an audio signal and output as sound. Also, the audio output unit 403 may also provide audio output related to a specific function performed by the terminal 400 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 403 includes a speaker, a buzzer, a receiver, and the like.

The input unit 404 is used to receive audio or video signals. The input Unit 404 may include a Graphics Processing Unit (GPU) 4041 and a microphone 4042, and the Graphics processor 4041 processes image data of a still picture or video obtained by an image capturing apparatus (such as a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 406. The image frames processed by the graphic processor 4041 may be stored in the memory 409 (or other storage medium) or transmitted via the radio frequency unit 401 or the network module 402. The microphone 4042 may receive sound, and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 401 in case of the phone call mode.

The terminal 400 also includes at least one sensor 405, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 4061 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 4061 and/or a backlight when the terminal 400 is moved to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 405 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which will not be described in detail herein.

The display unit 406 is used to display information input by the user or information provided to the user. The Display unit 406 may include a Display panel 4061, and the Display panel 4061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 407 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 407 includes a touch panel 4071 and other input devices 4072. Touch panel 4071, also referred to as a touch screen, may collect touch operations by a user on or near it (e.g., operations by a user on or near touch panel 4071 using a finger, a stylus, or any suitable object or attachment). The touch panel 4071 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 410, receives a command from the processor 410, and executes the command. In addition, the touch panel 4071 can be implemented by using various types such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. In addition to the touch panel 4071, the user input unit 407 may include other input devices 4072. Specifically, the other input devices 4072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a track ball, a mouse, and a joystick, which are not described herein again.

Further, the touch panel 4071 can be overlaid on the display panel 4061, and when the touch panel 4071 detects a touch operation thereon or nearby, the touch operation is transmitted to the processor 410 to determine the type of the touch event, and then the processor 410 provides a corresponding visual output on the display panel 4061 according to the type of the touch event. Although in fig. 4, the touch panel 4071 and the display panel 4061 are two independent components to implement the input and output functions of the terminal, in some embodiments, the touch panel 4071 and the display panel 4061 may be integrated to implement the input and output functions of the terminal, which is not limited herein.

The interface unit 408 is an interface for connecting an external device to the terminal 400. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 408 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal 400 or may be used to transmit data between the terminal 400 and an external device.

The memory 409 may be used to store software programs as well as various data. The memory 409 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. Further, the memory 409 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 410 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 409 and calling data stored in the memory 409, thereby integrally monitoring the terminal. Processor 410 may include one or more processing units; preferably, the processor 410 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 410.

The terminal 400 may further include a power supply 411 (e.g., a battery) for supplying power to various components, and preferably, the power supply 411 may be logically connected to the processor 410 through a power management system, so as to implement functions of managing charging, discharging, and power consumption through the power management system.

In addition, the terminal 400 includes some functional modules that are not shown, and are not described in detail herein.

Preferably, an embodiment of the present invention further provides a terminal, including a processor 410, a memory 409, and a computer program stored in the memory 409 and capable of running on the processor 410, where the computer program, when executed by the processor 410, implements each process of the above-mentioned embodiment of sending a random access message in an unlicensed frequency band, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the embodiment of the method for sending a random access message in an unlicensed frequency band, where the embodiment of the present invention is provided, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a base station) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A random access message sending method of an unauthorized frequency band is applied to a terminal and is characterized by comprising the following steps:

2. The method of claim 1, wherein the physical layer listen-before-talk (LBT) for N1 first random access channel locations selected by a higher layer comprises:

3. The method of claim 2, wherein the physical layer sends the random access message on a target random access channel, and wherein the method further comprises:

4. The method of claim 2, wherein the physical layer sends the random access message on a target random access channel, and wherein the method further comprises:

5. The method of claim 2, wherein the higher layer selects random access channels corresponding to at least two starting time points in the candidate random access channel positions, and obtaining the N1 first random access channels comprises:

6. The method of claim 2, wherein the higher layer selects random access channels corresponding to at least two starting time points in the candidate random access channel positions, and obtaining the N1 first random access channels comprises:

7. The method of claim 6, wherein when K is greater than 1, the K random access channel locations are located on different frequency resource ranges.

8. The method according to claim 2, wherein the higher layer selects random access channels corresponding to at least two starting time points in the candidate random access channel positions, and after obtaining the N1 first random access channels, the method further comprises:

the high layer sends the related information to the physical layer;

9. The method of claim 8, wherein the random access preamble index and the random access preamble target received power of the N1 first random access channels are the same;

10. The method of claim 1, wherein when the N1 first random access channel locations are random access channels corresponding to a starting time point, the physical layer sends a random access message on a target random access channel, and the method further comprises:

11. The method according to claim 10, wherein the N2 first random access channel locations are the most recently available random access channel locations of the candidate random access channels that are after the fourth starting point in time.

12. The method of claim 10, wherein after the physical layer sends the second notification message to the higher layer, the method further comprises:

13. The method according to any of claims 2 to 12, wherein the candidate random access channel is a random access channel corresponding to at least one synchronization signal block SSB satisfying a preset condition.

14. A terminal, comprising:

15. The terminal of claim 14, wherein the processing module comprises:

16. The terminal according to claim 15, wherein the selecting unit is specifically configured to: dividing successive candidate random access channel positions into Q groups of random access channel positions in terms of time and/or frequency, Q being an integer greater than or equal to N1; randomly selecting N1 groups of random access channel positions from the Q groups of random access channel positions; randomly selecting 1 random access channel position from each of the N1 sets of random access channel positions to obtain the N1 first random access channel positions.

17. The terminal according to claim 15, wherein the selecting unit is specifically configured to: randomly selecting a third starting time point from starting time points corresponding to continuous candidate random access channel positions; selecting K random access channel positions at each starting time point in the third starting time point and all starting time points after the third starting time point to obtain the N1 first random access channel positions, wherein K is a positive integer less than N1.

18. The terminal according to claim 14, wherein when the N1 first random access channel locations are random access channels corresponding to a starting time point, the terminal further comprises:

19. A terminal, comprising: a memory, a processor and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the steps in the unlicensed frequency band random access message transmitting method according to any one of claims 1 to 13.

20. A computer-readable storage medium, having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the random access message transmission method for unlicensed frequency band according to any one of claims 1 to 13.